The 53-year-old victim was close to a brook in Cottam Lane when she was approached by two men who demanded she gave them her jewellery and mobile phone.

She was pushed in the chest during the exchange and fell backwards, banging her head on the floor.

The incident happened at around 5.15pm on Friday 2 October.

The first offender is described as male, white, around 6ft, of skinny build, aged between 17 to 22 years old, with short dark hair. He was wearing a black hooded top and stonewashed jeans. He is described as having a pale complexion, prominent cheekbones and stained teeth.

The second offender is described as male, white, around 5ft 6ins, slim build, aged between 18 to 20 years old and was wearing a long sleeved light grey top. He spoke with a local accent.

DC Paul Taylor of Preston CID said: “This was an extremely frightening incident who was simply out walking her dog.

“Did you see anything suspicious in the vicinity at the relevant time? It may have been that you were in the area walking and saw the suspects?

“We are determined to trace the men responsible for the attack and I would urge anyone who may have witnessed the incident or indeed anyone with information about what happened to contact us.

“Similarly, if you have been offered any worn rings as pictured, earrings or a Samsung mobile phone for sale, please contact us.”